"Shishir has taken on an advisory role at Google," said a Google spokesperson, declining to provide further details. Re/code first reported on Tuesday that Mr. Mehrotra had vacated his position.

YouTube's plans to fill Mr. Mehrotra's position are unclear. YouTube's director of product management, Shiva Rajaraman, has taken over at least some of his duties, according to a person familiar with the matter. However, that doesn't mean Mr. Rajaraman has been tapped as his former boss's successor, either permanently or in the interim. The spokesperson did not respond to questions regarding Mr. Rajaraman's role.

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A six-year Google veteran, Mr. Mehrotra played a big role in helping YouTube grow into a company with an estimated $5.6 billion in annual revenue. In addition to consumer-facing products, he also oversaw the service's ad products. YouTube's best-known ad unit, the skippable TrueView pre-roll video ad, was developed and launched while Mr. Mehrotra served as director of product management.

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Tim Peterson

Tim Peterson covers digital media for Advertising Age out of the publication's Los Angeles bureau. He previously reported on social media and ad tech for Adweek and worked as a reporter handling the digital marketing beat at Direct Marketing News.